Which is NOT an example of a mycosis?

The correct choice identifies malaria as not being an example of a mycosis. Mycosis refers specifically to infections caused by fungi. Conditions like athlete's foot, yeast infections, and thrush are indeed fungal infections that result from various types of fungi. Each of these conditions illustrates how fungi can affect human health in different ways.

Athlete's foot is a common fungal infection of the skin, typically affecting the feet. Yeast infections are often caused by the overgrowth of Candida, a type of yeast, and can occur in various parts of the body, particularly in warm, moist areas. Thrush is another example of a yeast infection, characterized by the growth of Candida in the mouth or throat.

In contrast, malaria is caused by protozoan parasites from the genus Plasmodium, transmitted through the bite of infected mosquitoes. This category of disease falls squarely under parasitic infections, not fungal infections, which distinguishes it clearly from mycoses.